Hammer holder



FIG. 1 is a perspective view of a hammer holder showing my new design, the broken line showing of a hammer and arm is for illustrative purposes only and form no part of the claimed design;

FIG. 2 is a front elevational view in extended position;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and

FIG. 6 is a side elevational view thereof. 

The ornamental design for a hammer holder, as shown and described. 